COMPONENT AND MANUFACTURING METHOD THEREOF

• Main Authors: TOMITA KUNIKAZU, NISHIMURA KIMIHIRO, FUKUOKA KAZUAKI
• Format: Patent
• Language: English; Japanese
• Published: 13.09.2018
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide: a component with little heat treatment strain and excellent abrasion resistance and fatigue characteristics; and a manufacturing method thereof.SOLUTION: The component has a constituent composition comprising prescribed constituents with a Z value of 30 or more defined by formula (1), namely, Z=186-449C+38Si-8Mn-4Ni+7Cu-29Cr+15Mo+165V+142Ti-252Nb+368Al+4210B. The constitution to the depth of 100 μm from a surface of the component contains retained austenite of a volume fraction of 30% or less with the balance consisting of one or both of martensite and bainite. The constitution other than the nitrided part contains ferrite of an area fraction of 5-60%, and one or both of martensite and bainite of a total area fraction of 40-95%.SELECTED DRAWING: None 【課題】熱処理歪が少なく、かつ耐摩耗性と疲労特性に優れた部品およびその製造方法を提供する。【解決手段】所定の成分からなり、かつ、下記（１）式で定義されるＺ値が３０以上である成分組成を有し、前記部品の表面から１００μｍの深さまでの組織が、残留オーステナイトの体積率が３０％以下であり、残部がマルテンサイトおよびベイナイトの一方または両方からなり、前記浸窒部以外における組織が、フェライトを面積率で５〜６０％、マルテンサイトおよびベイナイトの一方または両方を合計面積率で４０〜９５％含む、部品。Ｚ＝１８６−４４９Ｃ＋３８Ｓｉ−８Ｍｎ−４Ｎｉ＋７Ｃｕ−２９Ｃｒ＋１５Ｍｏ＋１６５Ｖ＋１４２Ｔｉ−２５２Ｎｂ＋３６８Ａｌ＋４２１０Ｂ ・・・（１）【選択図】 なし